SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 65 



Fig. 3.— Hard sandstones which rest on the granite at the base of the Belt 

 Mountain rocks. These sandstones form cliffs along the canyon, about five 

 miles above Neihart, Montana. Photograph by Walcott. 



Fig. 4. — Slaty shales in which the Prepaleozoic crustacean fossils were found 

 near the mouth of Deep Creek Canyon, Big Belt Mountains, 16 miles east of 

 Townsend, Montana. Photograph by Walcott. 



